c# winform 创建文件，把值写入文件，读取文件里的值，修改文件的值，对文件的创建，写入，修改

#region 判断文件是否存在，不存在则创建，否则读取值显示到窗体

public FormMain()

{

InitializeComponent();

//ReadFile(Application.StartupPath + "//AlarmSet.txt");

//也是判断文件是否存在

//System.IO.DirectoryInfo info = new System.IO.DirectoryInfo(Application.StartupPath + "//AlarmSet.txt");

//MessageBox.Show(info.Exists.ToString());

//MessageBox.Show(Application.StartupPath + "//AlarmSet.txt");

//判断文件是否存在

if (!File.Exists(Application.StartupPath + "//AlarmSet.txt"))

{

//File.Create(Application.StartupPath + "//AlarmSet.txt");//创建该文件

FileStream fs1 = new FileStream(Application.StartupPath + "//AlarmSet.txt", FileMode.Create, FileAccess.Write);//创建写入文件

StreamWriter sw = new StreamWriter(fs1);

sw.WriteLine("[runtype]");//开始写入值

sw.WriteLine("type=1");

sw.WriteLine("/r/n");

sw.WriteLine("--报警设置 PPWS 号牌匹配位数 PPWZ 匹配位置 0前匹配 1后匹配");

sw.WriteLine("[Alarm]");

sw.WriteLine("PPWZ=0");

sw.WriteLine("PPWS=8");

sw.WriteLine("/r/n");

sw.WriteLine("[Server]");

sw.WriteLine("ListenPort=2005");

sw.WriteLine("/r/n");

sw.WriteLine("[Form]");

sw.WriteLine("PPWZ=0");

sw.Close();

fs1.Close();

}

//读取文件值并显示到窗体

FileStream fs = new FileStream(Application.StartupPath + "//AlarmSet.txt", FileMode.Open, FileAccess.ReadWrite);

StreamReader sr = new StreamReader(fs);

string line = sr.ReadLine();

int curLine = 0;

while (line != null)

{

if (++curLine == 7 && line.Equals("PPWZ=0"))//文件第7行并且值为PPWZ=0的时候设置单选钮选中前匹配

{

radioButton1.Checked = true;

radioButton2.Checked = false;

//MessageBox.Show("前");

}

else if (curLine == 8 && line.Equals("PPWZ=1"))//文件第8行并且值为PPWZ=1的时候设置单选钮选中后匹配

{

radioButton2.Checked = true;

radioButton1.Checked = false;

//MessageBox.Show("后");

}

if (curLine == 8)//文件第8行

{

textBox1.Text = line.Substring(line.LastIndexOf("=") + 1);//截取=号后边的值

}

//MessageBox.Show("第" + (++curLine).ToString() + "行: " + line);

//Console.WriteLine("第" + (++curLine).ToString() + "行: " + line);

line = sr.ReadLine();

}

sr.Close();

fs.Close();

}

#endregion

修改文件的值

#region 保存设置 按钮 按下

private void button6_Click(object sender, EventArgs e)

{

if(radioButton1.Checked == true )

{

EditFile(7, "PPWZ=0", Application.StartupPath + "//AlarmSet.txt");

EditFile(8, "PPWS=" + textBox1.Text, Application.StartupPath + "//AlarmSet.txt");

}

if (radioButton2.Checked == true)

{

EditFile(7, "PPWZ=1", Application.StartupPath + "//AlarmSet.txt");

EditFile(8, "PPWS=" + textBox1.Text, Application.StartupPath + "//AlarmSet.txt");

}

}

#endregion

#region 设置匹配

public static void EditFile(int curLine, string newLineValue, string patch)

{

FileStream fs = new FileStream(patch, FileMode.Open, FileAccess.Read);

StreamReader sr = new StreamReader(fs, Encoding.GetEncoding("utf-8"));//解决写入文件乱码

string line = sr.ReadLine();

StringBuilder sb = new StringBuilder();

for (int i = 1; line != null; i++)

{

sb.Append(line + "/r/n");

if (i != curLine - 1)

line = sr.ReadLine();

else

{

sr.ReadLine();

line = newLineValue;

}

}

sr.Close();

fs.Close();

FileStream fs1 = new FileStream(patch, FileMode.Open, FileAccess.Write);

StreamWriter sw = new StreamWriter(fs1);

sw.Write(sb.ToString());

sw.Close();

fs.Close();

}

#endregion